Sewing-machine shuttle.



H. A. BATES.

SEWING MACHINE SHUTTLE.

APPLICATION FILED MAR. 1 1, 1910v 'ii'nNnY A. BATES, or MIDDLETOWN, connno'rloo'r.

SEWING-MACHINE SHUTTLE.

seams.

Specification of Letters Patent.

Patented Mar. '7. 1911.

Application filed March 14, 1910. Serial No. 549,317.

To all whom it may concern:

lie it known that. I. HENRY A. Burns, a citizen of the United States, residing in Middletown, in the count of Middlesex and State of Connecticut, have invented an Innproven'ient in Seivinghiachine Shuttles, of which the following is a specification.

My invention relates to an improved bobbin case or holder adapted to receive a commercial thread bobbin without the employ ment or intervention of other inclosing parts. and the device of my invention is designed as an improvement upon the device shown and described in Letters Patent granted to me January 5, 1909. #908,883.

in the device of my present invention I employ a bobbin case or shell adapted to have connected thereto the usual book employed in this art and a pivoted lever secured to a slotted tubular pin of the bobbin case or shell. This bobbin case or shell is adapted to receive a volnte spring and over the volnte spring a removable commercial thread bobbin; the said thread bobbin being passed into the bobbin ease or shell overthe lever in an ont'turne'd position so that when the lever is turned down it extends over the thread bobbin and holds the same in place simultaneously establishing a function of tension by the volute spring against the un-.

der side "of the thread bobbin and producing agfrictiori between the outer surface of the thread bobbin and the under sideof the .le- (01' as turned down.

The parts are so'proportionel that I may a if desired, place over at least one side of the thread bobbin a thin metal diskadapted to prevent soiling theouter surface of the thread bobbin and which disk is preferably provided with a tubular hub of verythin metal adapted to fit into the core of the thread bobbin.- The spring is coiled for compression-in the direction of the axis of the thread bobbin and-its convolutions are therefore adapted to be brought into the same plane or'substantially the same plane by the introduction into the bobbin case or shell of the commercial thread bobbin.

In the drawing, Figure '1. is a plan representing the bobbin case or shell of Iny invention with the volute spring in position an the lever out-tu'rned ready toreceive the" thread bobbin.. Fig. 2 is a plan of the shell with the threadbobbin iirpositionand the lever turned down to hold the same in place. Fig. 3 is a cross section through. the bobbin d is passed over the lever 71 case or shell and an elevation of the central tubular pin and lever substantially in the position shown in Fig. 1. Fig. i is a central cross section at about the dotted line or, m, of Fig. 2. Fig. 5 is a plan of the thread bobbin alone, and Fig. 6 is a cross section of the thread bobbin showing applled thereto the thin metal disk and its tubular metal hub.

The bobbin case or shell (1 is adapted to have connected thereto as is usual in this art a book a which parts when so connected form the shuttle. I The central tubular pin a is advantageously formed as a part of the bobbin case or shell a and its outer end may project slightly to advantage beyond the plane of the circinnferential free edgeof the bobbin case or shell (1.. With this bobbin case or shell and pivotally connected to the central tubular pin is a lever device b;-2 being the plvot pin of the -lever.device as thus connected.

4 represents a plunger device in the cenbearing against the under side of the plunger ano inner surface of the bobbin case exerting an' outward pressure to hold the lever or in the position Figs. 2 and 4.

The commercial thread bobbin is represented at c and the tubular core thereof'at c and d represents a thread tension device which is common in this art, forming part of the bobbin case or shell and connected upon the outer surface thereof.

e is a volute spring shown under compression and tension in Fig. 4 and in its in Fig. 3. The larger base convolution 5 of the. spring fits snugly within the bobbin .case or shell a atthebase thereof so as to .prevent accidental displacement and the smaller convolution 6 comes at the center central tubular pin a Figs. 1 and 3' which agree in the position of the parts, show the bcbbincase or shell and parts formed therewith, ready to 1ece'ive the commercial thread bobbin 0 which and down around the'central tubular pin a -agaiiist the spring a, 'flattenin the same and putting it Under tension. e lever device In is. turnedover thread bobbin, .,f.rom the position Fig. 3 to device b. either in the position Figs. 1 and 3,

free position without compression or tension after the introduction of the commercial traltubular pin a and 3 a helical spring or top of the spring directly. around'the the position l 2 and 4,in which the upper surface. of the thread bobbin comes against theunder surface of the lever-and this lever serves to hold the same in position and establish a friction as between thespring e and the under surface of the lever to prevent a too'free unwinding of the thread 'bobbin.

I have shown in Fig. 6 a disk and tubu lar hub? of thin metal which may be employed if desired in connection-with the de- \-'ice-; of my improvement; it only necessitating a little larger o 'i'ening in the core of the thread. bobbin to receive the tubular hub formed with thisdisk; the function of the disk mainly 'htlllg' if) preserve the surface of "the thread of the thread bobbin clean for .the thread bobbim but form'of the bobbin case holder 0, a bobbin casefor shell and first of the commercial thread bobbin.

form of my invention over and abovethe place therein the volute spring employing the lever device directly against: the surface By this form of said patent 1 am enabled to reduce the thickness; through the shuttle and to increase the size of the commercial thread bobb1n and the amount of the thread carried thereby by about, fifteen or twenty per (rcnt. which efl'ects'a marked saving in both the cost of the shuttle and the useful life of the thread bobbin, to say nothing of the timeusually consumed in taking outthe cores of expended thread bobbins and plti'c-- ing in the shuttle fresh bobbins.

I claim as my invention:

In'a sewing machine shuttle, a bobbin case or shell having a cylindr eal part and a back and opt-n on one side a wlbadapted' to receive a cored commercial boliibi nfof thread onlyi'a central tubular pin,'.a spring" actuated lever device pivoted to 'the tubular pin and adapted to be turned down over the thread bobbin to hold the 'smndin the bobbin caseiand a' volnie spring within the bobbin case with its larger convoliltion at the base substantialtv fitting the bobbin ease and a central portion i-xtei'iding around the tubular stem and said spring coming between the'bobbin ease or shell and the thread bobbin and acting expansiv'ely for friction and to assist in the separation of the parts when the lever is released.

Signed by me this/tth day of March 1910.

HENRY A. BATES.

Witnesses:

Gno. T. PIXCKNEY,- E. ZAGHARIASEN. 

